”Utilization of Different Techniques and Industrial By-Products for the Preparation of Low Density and High Quality Building Units”

Aerated (cellular) concrete is basically composed of fine ground sand as the filler and cement (and/or lime) as the binder slurry that foamed by introducing air through it when a foaming affecting agent like Al powder used. In practice, the fine sand fillThe present study deals with the investigation of some factors which are believed to influence the quality of the low density (aerated) building units. Also, the effect of incorporation of some industrial waste by-products as to partially substitute equalTo fulfill this aim, the main starting materials (ground sand, ordinary Portland cement, lime and aluminum powder) as well as the utilized industrial waste by-products (Homra, water-cooled slag, air-cooled slag and silica fume) were chemically analyzed usFor the low temperature preparations, the main starting materials were ordinary Portland cement and aluminum powder. The influence of Al powder content and of water / solid ratio on the physico-mechanical properties of the products were studied. Also, theFor the samples prepared under high pressure steam curing, the relative proportions of the main starting materials on the physico-mechanical properties were firstly undertaken for the sake of optimization. This was followed by studying the influence of waThe effect of autoclaving conditions either pressure or period of hydrothermal treatment was carefully studied. Steam pressures of 10, 12 and 14 atmospheres (bars) for periods ranged between 2 hrs and up to 12 hrs were applied.The influence of the storage conditions of the lime used for preparation of slurry mixes was also considered.One of the main targets of this study is to investigate the influence of substitution of various percents of each of the following: waste clay-bricks (Homra), water-cooled slag, air-cooled slag, silica fume and ultra fine sand to replace equal amounts of